performSemanticsAction method
- SemanticsActionEvent action
override
Called whenever the platform requests an action to be performed on a SemanticsNode.
This callback is invoked when a user interacts with the app via an accessibility service (e.g. TalkBack and VoiceOver) and initiates an action on the focused node.
Bindings that mixin the SemanticsBinding must implement this method and
perform the given action
on the SemanticsNode specified by
ui.SemanticsActionEvent.nodeId.
Implementation
@override
void performSemanticsAction(SemanticsActionEvent action) {
// Due to the asynchronicity in some screen readers (they may not have
// processed the latest semantics update yet) this code is more forgiving
// and actions for views/nodes that no longer exist are gracefully ignored.
_viewIdToRenderView[action.viewId]?.owner?.semanticsOwner?.performAction(action.nodeId, action.type, action.arguments);
}